Furnace bottom



April 14, 1931. D. .CUSHING FURNACE BOTTOM Filed July 27, 1929 MW Jazz)? 5 Patented Apr. 14, 1931 NT *oF' ics DA ItTIEL CUSI-I ING, o oAMBnIneE, MAssAcnusnr'rs summon Application filed July 27,

This invention relates to furnaces especially designed for the melting of non-ferrous metals.

It is the object of the invention to provide the bottom of such a furnace with a lining of heat-resisting blocks or bricks, said bottom and lining being so designed that'the' blocks may be readily assembled with the furnace bottom and that they will be securely held therein. 2

My invention further relates to arrangements and combinations of parts which will be hereinafter described and more particu' larly pointed out in the appended claims.

A preferred form of the invention is shown in the drawings in which Fig. 1 is a sectional side elevation of portions of a furnace including my improved bottom;

Fig. 2 is a plan View of th tom shown in Fig. l; e Fig. 3 is a detail sectional elevation,taken along the line 33 in Fig. 2, and

, Figs. 4 and 5 are detail sectional views .25 showing slight modifications.

Referring to the drawings, I have shown a furnace bottom 10 hinged at 11 to brackets 12 mounted on the under side of the furnace side walls 14. The upper surfaceof the bot- 30 tom 10 is preferably inclined downwardly toward the tapping spout of the furnace and away from the hinge 11.

The bottom 10 is provided with an upwardly extending peripheral rim 16 having an internal annular. flange 17 formed thereon. The bottom 10 is also provided with a hole or opening 18 through .which a clamping bolt 20 may be inserted.

The heat-resisting blocks or bricks 22 used with my improved furnace bottom are preferably formed of sector shape, as indicated in Fig. 2, and are provided with peripheral grooves 24 on their outer faces, in which the annular flange 17 may be received. v

In assembling my improved furnace bottom, a layer of heat-insulating. material is first placed on the bottom 10 within the rim 16, this material being of such thickness that the grooves 24 in the blocks 22 will be correctly aligned with the internal flangell.

20 e furnace botdesigned to closely abut each other but are melting of non-ferrous metals.

BOTTOM 1929. Serial No. 331,555.

The blocks 22 are then placed in position but the last brick to be inserted, is formed in three parts 32, 33 and 34. The side portions 32 and 33 are first inserted, this being ren i 'dered possible by the absence of the middle portion 34. After the side portions are spread apart, the middle portion 34 may be plac'edin position, thus locking the parts and 33 and the remaining blocks 22 within the flanged rim 16 of the bottom 10; I I

For further security andto complete the bottom, a circular brick 40 is inserted between the inner ends of the bricks 22, this brick 40 beingpreferably conical insection, as shown in Fig. 1, the inner ends of the bricks 22 be-. ing correspondingly beveled. The brick 40 may be secured in position by the bolt 20 in the opening 18, previously described.

The bricks 22, and centerbrick 40 are not preferably somewhat spaced apart, as indicated' in Fig. 2, the spaces between the bricks" being thereafter filled with sand or cement, as indicated at 44 in Fig.1.

. When the bottom is swung tolits 'operatve or raised position,-as indicated in Fig. 1, and is suitably secured in such position, a sealing ring 46 0'f sand or suitablecement is placed between the bricks 22 and the side walls'14, thus effectively sealing the bottom of the furnace. 1 r

A furnace bottom of this construction has been found particularly satisfactory forfthe When the bricks become badly burned or worn, they may-bereadily removed and replacedby loos ening the single bolt 20. v I

In Fig. 4, I have'shown a slight modifi cation in which the brick 46 is provided with a shoulder 47 positioned under'the flange 17. This construction avoids some of the stresses caused by expansion or contraction of the rim16.=

Another manner of accomplishing the same result is indicated in Fig. 5 in which therim '95 50 is undercut on its inner face and in which the outer face'of the brick 52 is similarly bevelled to prevent upward displacement thereof.

, Having thus described my invention and ice the advantages thereof, I do not Wish to be limited to the details herein disclosed, otherwise than as set forth in the claims, but What I claim is 1. In a furnace, a bottom having an upstanding circumferential rim portion, and a plurality of heat-resisting sector-shaped lining blocks iitting snugly Within rim portion, one of said blocks being formed of tworsubstantially sector-shaped outer parts and a mlddle part of uniform tlllClHlBSS.

2. In a furnace, a bottom hav ng an upstanding circumferential rim portion, and a plurality of heat-resistin lining blocks fitting snugly within said run portion, said block's being sector-shaped-an'd onebloclr be- 111 formed in a )lural'it of nieces one o V l,,, which pieces is of UDIfOllll'WlCl-t-ll throng-n out its length.

o. In a iurnace, a botionrhav ng an upstanding-folrcumferential rim portion, a plurality= of heat-resisting sector-shaped lining blocks littlng snugly Within said n portion, a center locking-block, and means to secure said center block in position to lock sector-shaped blocks in said bottom.

4. In a furnace, abot'tom having-an upstanding circular rim portion with a-n' in ternal annular flange formed thereon, a plurality of heatrresistinglining blockscut away in their onto" faces to receive'said flange, a

center lockingblock, and means to securesaid center-'bloclrin position to prevent cisengagement of saidlining bloclrsfrom said annular flange. 1

. 5. In a furnace, a. bottom having an upstanding "circularrim portion With an internalannular flange formed thereon, a plurality ofheat-resisting linin blockscut away 1n their outer-faces to receive said flange, a

center lockingbloclnand means tose-curesai'd center block 'inposition, saidblock being conical in cross section-with its small end downward When said bottom isin operative position. 7

6. In a furnace, a bottom having an upstandingcircumferential rim portion, alayer of heat-insulating material disposed Within said rim'portio'n, a plurality of heat-resisting sector-shaped blocks resting on said heatresisting material and a center locking block effective to prevent inward "displacement of said sector-shaped blocks; 7

'7; In a furnace, a bottom having an upstanding circumferential rim portion *and a pluralityofheat-resisting lining. blocks fit ting snugly Witiiin said rim portion, said blocks being sector-shaped and interlocking with said rim against relative upward moveme'nttherein, and one ,of said blocks being formed in a-plural-ity of pieces to facilitate interlocking insertion thereof after all of the one-piece sector-shaped blocks have been as sembled in said bottom and Within said interlocking frim 8. In a furnace, a-bottom having an upstanding circumferential rim portion With an internal annular flange, a plurality of heatresisting sector-shaped lining blocks fitting snugly Within said rim portion and grooved n my signature.

DANIEL cusriiue;

In testiincn whereof I have hereunto 'af-j ill) 

